Modify 1.0 VTS tests to consume test struct directly.

Implement converter utilities constructing HIDL model and request from
TestModel.

Bug: 123092187
Bug: 138718240
Test: All VTS
Change-Id: I0b26b7f41d31d5e63ed083ab5f6f269a3620f034
Merged-In: I0b26b7f41d31d5e63ed083ab5f6f269a3620f034
(cherry picked from commit 8e8b70c4)